1980One should be defrost. GM defaults to defrost in event of failure. This is done because keeps windshield clear if HVAC fails. I think other is source to the switch. Source should come from vacuum ball after check valve, but I'll have to check.
What year??
People are tending to get lazier and lazier even on the internet.Some times you just got to surf around.
Pics are ordered working your way from the engine compartment harness towards the HVAC controls in the dash.
I can get more pics if need be, but keep in mind my car at the time of posting only has the front clip off.
Pic#11: Grounds, ringlets go to passenger fender, black plastic plug is grounded to tab on blower motor.
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Pic#10: Purple power wire to blower motor.
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Pic#9: Orange, light blue, red...
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